Benz aktiengesellschaft



Jan. 12, 1932. 0. sElzER PNEUMATICALLY HYDRAULICALLY ACTUATED TOOL Fi`1ed March 3, 1931 liv i OTTO SEIZER, F SINDELFINGEN, NEAR STUTTGART,

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Patented Jan. 12, 1932 UNITED STAT Es PATENT OFFICE GERMANY, ASSIGNOR T0 DAIMLER- BENZ AKTIENGESELLSCHAFT, 0F STUTTGART-UNTERTURKHEIM, BERLIN, GEB- MANY, A CORPORATION OF GERMANY PNEIIMIAJIIIGALLY OB' HYDRAULICALLY AUIUATED TOOL Application fusa March s, 1931, serial No.

'It has hitherto been customary in carriage building and in furniture factories to secure cloth, leather, artiiicial leather and the like to wooden parts by means of wire nails driv- This method'of fastening is very complicated and occupies a gre'at deal of time.

The object of the present invention is to simplify the fastening of upholstering material, by driving in individual stitching clips or staples by means of a pneumatically or' hydraulically actuated tool, the cutting off, bending over and driving in being e ected for example by means of two pistons, which are movable relatively to a casing and to one another, and which overtake one another.

at the end positions, in such a way that one piston moving in advance cuts ot' the wire and bends it over, and the other overtaking the first drives in the clip thus formed.

The cuttin off and bending round of the wire are pre erably eii'ected by means of the outer piston and the hammering in by the inner piston. The tool is provided with a special device for "feeding the wire'. This device maybe driven either by the pressure iiuid or by redding from one of the two pistons. The wire is preferably rolled up and lodged in the device.

` One constructional form of the invention is illustrated by way of example in the accomianying drawings, the motive fluid being assumed to be conpressed air, which is particularly suitable for this purpose.

In these drawings,

' Figure 1 shows the device diagrammatically in longitudinal section, both pistons being in their uppermost position.

Figure 2 shows a longitudinal section similar to Figure 1, but vwith a different piston position. In the wire-feeding piston, instead of the duct leading the air over the piston, the duct leading the air under the piston is shown.

Figure 3 shows a practical construction of the device in side elevation, partly in section,

and

Figure 4 shows a cross section through the wire-feeding device shown in Figure 3.

In the diagrammatic constructional View, 1

519,887, and in Germany October 26, 1929.

piston 2 runs a piston 3. To the piston 2 are connected underneath two bars 4, which are guided in an extension 36 of the casing.' Between the bars 4 is guided an expansion 6 of the piston rod 5 of the piston 3. Through a tube 7 is supplied a wire 8, which at iirst rests in a groove 9, in a resilient tongue 10, as shown in Fi res 1 and 3. A. valve body 12, adjustable y means of a bent lever 11, controls the compressed air, Figure 1 shows the device in the initial position. The two pistons are in their uppermost position. The space 13 above the outerI piston 2 communicates with the atmosphere by a duct 15 and a recess 16 in the valve body 12, and the spaces 17 and 18 underneath the piston are connected by a bore 19 with the compressed air su ply.

If t e valve body 12 is adjusted by means of the lever 11the spaces 17 and 18 underneath the pistons are connected" with the ton 2 with the compressed air. The piston 2 now descends, the bars 4 cutting oi the stitching wire 8 and the said stitching wire then being held by the resilient tongue 10. As soon as the piston 2 has reached its lowest position, the aperture 20 sets `free the passage 21 to the space 14, and the piston 3is thrown downwards inside the piston 2, pushes the spring 10 to the side, and hammers in the stitching clip. During these operations the lower piston spaces 17 and 18 are at atmospheric pressure. The feeding of the stitching wire, as diagrammatically indicated in Figures 1 and the ascent of the two pistons 2 and 3, the piston 22' is pressed downwards by the compressed air through a distance corresponding to the length of the wire nail to be supplied. As soon as the pistons 2 and 3 descend, the piston 22 ascends again. It is controlled in a simple manner by the fact that the space 23 beneath it communicates with the space 13 above the piston 2, and the space 24 above it communicates with the space 18 underneath the piston 2. The connecting of the wire with bending it round, andl 2, may be effected in such a way that during the piston must be carried out .in such a way that the descending piston takes the wire withit while the ascending piston releases it.

In the constructional form illustrated in Figure 3, the stitching wire is fed by means of two rollers connected with toothed wheels 25 and 37. The toothed Wheels mesh with one another. The toothed wheel 37 is rotatably mounted upon the hub of the toothed wheelv 32, which meshes with a rack 31. The latter i is connected by a crosshead 33 with the upwardly prolonged piston rod 34 of the inner piston, so that they move together. In the hub of the toothed wheel 32 is guided a spring pin 35, the upper bevelled surface of which engages in a recess in the toothed Wheel 37 in such a. way that the latter is carried along with it when the toothed wheel 32 is rotated -by the ascending rack 3l. When the rotation is in the opposite direction the pin yields under theaction of the inclined surface and the toothed wheels 37 and 25 remain at rest." In this position the wheel 25 is secured by a spring detent 29. vIf the inner piston now ascends, that is to say, returns into its initial position illustrated in Figure 1, the stitching wire is displaced by the toothed wheels 37 and 25, while the descending rack exerts no action .upon the rollers. The stitching wire then enters the groove 9 in the resilient tongue 10. The latter is preferably placed in the plane of the feed passage 7 for the stitching wire 8, that is, `degrees from the position shown'in Figure 3.

The butt 27 of the revolver-shaped casing is adapted to contain a spool 26 of staple material. 28 denotes a Wooden piece to which a cloth 30 is secured.

What I claim is: p

1`. In a device for securing cloth, leather, paper and similar materials to members made of wood or similar materials, wherein the fastening is effected by means of staples cut off from a suitable materia-l supplied, two rams controlled by fluid pressure in one stroke, one of which cuts oflz` the material supplied for the staples and bends it into sta le form, and the other is thereupon moved orward relatively to the first and hammers in the cut and l bent staples. f

2. In a device for securing cloth, leather, paper and similar materials to members made of wood or similar materials, wherein the fastening is effected by means of staples cut off from a suitable material supplied, a ram for cutting off and bendin the material supplied, a piston actuated y fluid pressure for driving forward the said ram, a second ram for hammering in the staples cut and bent by the first ram, the second ram being located inside the first ram, and a second piston actuof wood or similar materials, wherein the fastening is effected by means of sta les cut off' from a suitable material supplie two rams located one inside the other, a hollow piston actuated by fluid pressure connected with one of the rams, and a second piston connected with the other ram, the second piston being slidably arranged inthe first piston in such a way that in the end position of the first piston pressure is applied to the second piston, which pushes ,forward the 'ram connected with it relatively to the first ram and beyond the latter.

4. In a device for vsecuring cloth, leather, paper and similar materials to members made of wood or similar materials, wherein the fasteningis effected by means of staples cut off from a suitable material supplied, means actuated by fluid pressure for cutting off, bending and hammering in staples of the suitable material supplied, and means actuated by fluid pressure for feeding the said staple material to the cutting position, the said feed ing means gri ping the staple material and displacing it orward when moving in one direction but releasing it when moving in the other direction.

5. In fa device for securing cloth, leather, paper and similar materials to members made of wood or similar materials, wherein the fastening is effected by means of staples cut off' from a lsuitable material supplied, means actuated by fluid pressure for cutting off', bending and hammering in staples of the suitable material supplied, means for feeding the said staple material to the cutting position, reciprocating means actuated by fluid pressure and capable of moving the said feedlng means in the feeding directlon only, and ratchet mechanism adapted to revent the feeding means from moving in t e op osite direction.

In testimony whereo I affix my signature.

' QTTO SEIZER.

ated by fluid pressure for driving forward 

